Electrical relay



Dec. 13, 1932. R MAR-"N 1,891,026

ELECTR ICAL RELAY Original Filed Jan. '7, 1932 Lw /M IN VENTOR Paul M Mapezl z BY 42 W H18 A TTORNE Y Patented Dec. 13, 1932 UNITED s'rArss PATENT oFFic if PAUL N. MARTIN, 0F SWISSVALE, PENNSYLVANIA, ASSIGNOR TO THE UNION SWITCH &

SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA Original application filed January 7, 1932, Serial No. 585,326. Divided and this Serial 1101632325. i

My invention relates to electrical relays and particularly to relays of the direct current polarized type comprising a neutral armature responsive to the pressure and absence of operating current, and a polarized armature responsive to the polarity ofv the operating current.

Relays of this type, as ordinarily constructed, are characterized by the fact that the neutral armature opens momentarily when the polarity of the current supplied tothe operating winding is reversed. One feature of my invention is the provision of novel and improved means for preventing the neutral armature from opening due to the reversal of the polarity of the current supplied to the operating winding.

The present application is a division of my copending application, Serial No. 585,326, filed on January 7, 19.82, for electrical relays.

I will describe two forms of relays embodying my invention, and will then point out the novel features thereof in claims.

In the accompanying drawing, Fig. 1 is a View, partly in side elevation and partly diagrammatic, showing one form of relay embodying my invention. Fig. 2 is a bottom plan view showing a modification of a portion of the relay illustrated in Fig. 1, and also embodying my invention.

Similar reference characters refer to similar parts in both views.

Referring first to Fig. 1, the relay in the form here shown comprises a U-shaped core member 5 provided with pole pieces J and K, and carrying the usual operating winding 6. The relay also comprises two auxiliary pole pieces L and M connected by an auxiliary U- shaped core made up of two legs 10, 10 and a backstrap 9. The backstrap 9 is, of course, offset to pass aroundthe winding 6 on the main core 5. Coacting with all four pole pieces L, J, K and M is an auxiliary armature F which is biased by gravityto drop away from the pole pieces, whereby it is attra'cted to the pole pieces when the winding 6 is energized. The armature F is provided with a portion 11 of reduced.cross-sectional area between the pole pieces J and K, the area of this portion being such that it is saturated ELECTRICAL RELAY by magneticflux when the winding 6 is energlzed. The legs 10 and 10 are providediwith bands or ferrules 8, 8 respectively, for the purpose of delaying change of flux in'the auxiliary magneticpath.

mainderof the flux is forced to flow in a path which passes from pole piece J through application filed September the left-hand portion of armature-F, pole piece L, leg 10, backstrap' 9, leg 10*, pole piece M, and the right-hand portion. of armature F to pole piece K. When the polarity of the current supplied to the winding 6 is reversed, the "portion of the magnetic flux which flows directly through theSarmature between pole pieces J and K will momenta rily pass through zero, but at this time the flux flowing through the auxiliary magnetic path will stillhave an appreciable value, due to the bands or ferrules 8, 8, and will serve to keep the armature F in its attracted position until the flux in the main magnetic circuit builds up to a value which is suflicient to hold the armature in its attracted position. When winding 6 becomes dee nergizeol for an appreciable length of time, however, the'fiux flowing through both the main and auxiliary ner shown in Fig. 2, in which case the armature, which is here designated F will be U-shaped as shown in the drawing, the re stricted portion 11 being disposed in that part of the armature which bridges pole pieces J and K.

It is understood that the relay shown in Fi 1. and the modified form of relay shown in lu 2 Will be provided, in addition to the armature F or F with a polarized armature current supplied to the operating winding 6, but this armature is omitted from the draw ing because it is not essential to a clear understanding of my invention.

Although I have herein shown and dewhich is responsive to the polarity of the P7: 1

scribed only two forms of relays embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is: I p

1. A relay comprising a core provided with the usual main pole pieces and operating winding, an auxiliary core member having two auxiliary pole pieces, means for delaying the change of flux in said auxiliary core member, and an armature coacting with all four of said pole pieces, said armature having a portion of restricted section between said two main pole pieces to force flux through said auxiliary core member.

2. A relay comprising a core provided with the usual main pole pieces and operating winding, an armature coacting with said pole pieces, an auxiliary path for magnetic flux created by said winding passing from one of said pole pieces through a portion of said armature to the other pole piece and including an auxiliary pole piece also coacting with said armature, and means for delaying change of flux in said auxiliary path, said armature having a part of reduced section between said main pole pieces which becomes saturated when the winding is energized and so forces flux through said auxiliary path.

In testimony whereof I afiix my signature.

PAUL N. MARTIN. 

